US3910509A - Mill which operates at an overcritical speed of rotation - Google Patents

Mill which operates at an overcritical speed of rotation Download PDF

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Publication number
US3910509A
US3910509A US450239A US45023974A US3910509A US 3910509 A US3910509 A US 3910509A US 450239 A US450239 A US 450239A US 45023974 A US45023974 A US 45023974A US 3910509 A US3910509 A US 3910509A
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grinding
container
members
rotation
mill according
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US450239A
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Wilhelm Eirich
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Maschinenfabrik Gustav Eirich GmbH and Co KG
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Maschinenfabrik Gustav Eirich GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/02—Centrifugal pendulum-type mills

Definitions

  • Appl' 450239 tion comprises a grinding container in the form of a rotational body, and one or more internal grinding [30] F i A li ti P i it D t members revolvable around the axis of the grinding Mar 14, 1973 Switzerland 3732/73 container at overcrihcal Speed-
  • the grinding her or members are rotatably mounted on a trailing 52 us. or 241/120; 241/130 arm which is mounted carrier that can [51 Int. c1. 1302c 15/02 axis which is substantially Parallel the am [58] Field of Search 241/1O8 110 117, 118 of rotation of the grinding container.
  • the present invention relates to a mill which operates at an overcritical speed of rotation, in which a grinding member rolls over the material to be ground, in a grinding container which rotates about its axis together with the material to be ground, at an overcritical speed of rotation.
  • the particles to be crushed are loaded until they break up, abrupt changes in force being conducive to crushing of the particles. Therefore the particles of the material to be ground should be subjected to loadings which fluctuate as rapidly as possible, and which can be produced by the action of pressure, impact, shearing and also due to the expansion effect which follows the aforementioned kinds of loading.
  • the quite considerable power requirement necessary for crushing the particles rises sharply with decreasing particle size.
  • Recent findings indicate that it is hardly possible to get below a given minimum particle size, which varies from one material to another, because in that region the particles can only be plastically deformed with the previous methods, or because the amount of energy required for crushing the particles cannot be transmitted to the particles to be crushed, or cannot be transmitted sufficiently quickly.
  • the minimum particle size is also determined by the particles which agglomerate under pressure.
  • Ball mills are extremely widely used, in'particular in the cement industry.
  • the degree of efficiency of such gravitational force ball mills is very low and is of the order of magnitude of 1 percent.
  • Recent tests and attempts at increasing the level of efficiency have resulted in a considerable increase in efficiency in the case of so-called planet ball mills and swing ball mills.
  • hitherto these more recently developed mills could only be constructed in relatively small sizes. Although they make it possible to achieve grinding results as are obtained in much larger gravitational force ball mills, they are not in a position, due to their relative smallness, to provide the desired increase in respect of grinding large amounts of material.
  • mills which have a overcritical speed of rotation and mills which have a subcritical speed of rotation.
  • critical speed of rotation in the case of mills is that speed of rotation at which the centrifugal force exceeds the weight of the members, as determined by the force of gravity.
  • deflector members should be incorporated into the grinding container, which again locally slow the material being ground and the grinding balls down to a subcritical peripheral speed, so that the material and the balls crash.
  • Such mills are to a certain extent an agitator ball mill with a stationary agitator vane, which results in a high power requirement and relatively low speeds of rotation. The material being ground always'has to be accelerated again to a higher speed.
  • a ball or roll mill having a vertical axis of rotation, for crushing cocoa, chocolate, varnish pigments, enamels, and the like, having a cylindrical container within which there is arranged a coaxial rotor. Disposed at the surface of the rotor are grinding rollers which eachhave their rotary mounting spindle guided in radially extending slots in the rotor. Axial passages are provided in the end. walls of the cylindrical container, for the delivery and discharge of the substance to be crushed, or the material to be ground. The material to be ground therefore moves parallel to the axis of the container along the cylindrical wall thereof, in a downward direction, and this excludes operation at an overcritical speed of rotation. In addition, the mounting of the grinding rollers is exposed to the material to be ground, so that the bearings are subjected to a high rate of wear.
  • the invention is based on the problem of providing a grinding principle which utilises the method, which is favourable per se, of holding the material to be ground against the wall of the grinding container, by centrifugal force, but which avoids thedisadvantages thereof, in particular the disadvantages regarding degree of efficiency, wear and limitation in respect of grain size.
  • the invention seeks to permit grinding 'over wide ranges, with small, medium and large. machine units, while saving space and increasing the degree of efficiency. It is also intended to permit savings both as regards the apparatus and also the operating costs.
  • this problem is solved by using a grinding principle in which grinding members rotate in the grinding container about the axis thereof at an overcritical speed of rotation which is dif-' ferent from the speed and/or the. direction of rotation of the grinding container, while the grinding members roll over the material to be ground, rotating about their" 3 own axis, and lying against the material under the effect of centrifugal force.
  • the grinding principle according to the invention can be embodied both with substantially cylindrical grinding members alone, and also with grinding members which in particular are in the form of wheels of tapered cross-section, in conjunction with grinding balls.
  • Very small balls can be used in this arrangement, which makes it possible to increase the number of contact points and a reduction .in the contact surface areas of the balls.
  • the power required is in fact higher than when operating without grinding balls, but normally the power required does not reach the: value of the power required by agitator ball mills.
  • a mill according to the invention is characterised in that a grinding container whichis in the form of a rotational body is mounted drivably at an ,overcritical speed of rotation about an axis which extends substantially parallel to its axis of rotation, and that eachgrinding member which revolves around the axis of theygrinding container at an overcritical speed is rotatably mounted in a trailing arm which is mounted on a carrier pivotably about an axis which is substantially parallel to the axis of rotation of the grinding container, the carrier being drivably rotated about the axis of the grinding container, while means are provided for controlling the difference between the peripheral speed of rotation of the grinding members and the speed of rotation of the grinding container about the axis of the grinding container.
  • the grinding members which rotate on the pivotal trailing arms roll on the grinding face of the grinding container or the material to be ground, with a corresponding speed difference.
  • the individual grinding members which are generally substantially cylindrical can be secured to a whip-like suspension means by way of which they can be drawn around the centre of the grinding container in a circular motion.
  • the grinding members are urged towards the grinding face of the grinding container, with a force equal to a multiple of their weight.
  • the grinding members roll over the grinding face of the container or over the material to be ground which is disposed on the grinding face, and which is compressed and held firm thereagainst by the centrifugal force. Very high levels of centrifugal force can be attained.
  • the number of times that the grinding members roll over the material in each unit of time may be controlled by adjusting the difference in travel from ,the grinding container to the grinding member, and by tions of rotation are the same and the speeds of rotation are almost the same, and a maximum grinding action can be attained when the directions of rotation are opposed and the speeds of rotation are high.
  • the plate has a tendency to entrain the grinding members at the same peripheral speed. However; the grinding members are kept down to the lower peripheral speed by means of the grinding member suspension means.
  • the rolling resistance can therefore be kept relatively low, it is possible (in this case also the increase in weight due to centrifugalforce is of use) for the indi-.
  • the grinding members can also be eccentricallymounted and eccentrically constructed, or can be made out-ofbalance in some other way (for example by means of weight distribution), so that the grinding members make. It possible easily to apply the out-of-balance effect which is known from swing mills, without the necessity of moving large out-of-balance masses. Owing to the pivotal mounting of the grinding members on their rotating carrier, the container is substantially protected from the material to be ground.
  • the grinding members preferably comprise pairs of grinding rollers, one roller being mounted above the trailing arm and one roller being mounted below the trailing arm, on a shaft which is carried in the arm.
  • the shaft is non-rotatably carried in the pivotal arm, and each grinding roller is independently rotatably mounted therein.
  • the grinding rollers of each pair are rigidly mounted on their shaft, while the shaft is mounted, in the form of a spindle, rotatably in the associated trailing arm.
  • the grinding members can also be constructed with an out-of-balance, in order that the impact action or the bounce effect of the grinding members against the material to be ground is varied.
  • the grinding members can be solid in construction, but to be so constructed in an annular configuration that a layer of resilient material is carried on an internal hub, and a grinding ring comprising a material having a high resistance to wear is fitted over the layer of resilient material.
  • a further modification of the mill according to the invention provides that the axis of rotation of the grinding member carrier is arranged eccentrically relative to the axis of rotation of the grinding container.
  • a resilient means for limiting the outward movement of the grinding members towards the wall of the grinding container also provides the possibility of adaptation to a material of a different nature, for example of a different degree of hardness.
  • changing the weight of the grinding members or the peripheral speed of the grinding member carrier involves expensive operations.
  • an adjustable spring force is interposed between the grinding member carrier and the grinding member mounting, for example in the respective pivotal arm, the pressure of the grinding members against the material to be ground can be reduced or increased, depending on the nature of the material, by adjustment to the spring force.
  • a suitable traction spring can be fitted between the trailing arm and the grinding member carrier.
  • a pneumatic tyre can be disposed at the periphery of the grinding member carrier.
  • a pneumatic tyre lies for example an angle lever which acts on the respective grinding member in question. All the pairs of grinding member can be loaded or relieved of load to an absolutely uniform extent, by varying the air pressure in the pneumatic tyre.
  • the material to be ground can also be circulated in the grinding container, due to the grinding members having the effect of swirling up the material, in a manner not dissimilar to the action of a motor vehicle wheel on an ordinary road surface.
  • the coarser particles in the atmosphere in the grinding container settle more quickly than the fine particles, so that the fine particles can be discharged from the container by means of a suitably directed air current.
  • a precautionary action by means of which the coarse particles can, so-tospeak, be concentrated the grinding container, which makes it possible .to increase the level of efficiency of the method and the mill.
  • the fine material can be discharged through a discharge channel if the discharge apertures of the grinding container lie in the region of a subcritical speed of rotation. If the speed of rotation in the discharge region is overcritical, it is possible to use a collecting pipe in which a screw with a flexible shaft is movably disposed. This screw is charged with material at the collecting means, and then conveys the finely ground material through the screw tube into the vicinity of the mounting hub, and empties it into an annular collector.
  • the flexible screw has its housing secured to the grinding member carrier, and extends through a hole in the bottom of the container. Below the bottom of the container the screw has a friction wheel drive which rolls against the stationary mounting hub. As the discharge end of the screw rotates with the grinding member carrier, it is necessary to provide an annular collector around the hub, in order to collect the fine material discharged from the container.
  • At least a part of the movement of air in the interior of the container can be derived from the rotary movements of the components. It is particularly advantageous for a blade wheel to rotate with the grinding members about the axis of the grinding container, whereby a desiredflow of air is produce in the container. The amount of air displaced and/or the direction of displacement of the air can be determined by adjustment of the blades of the blade wheel.
  • the reduced pressure which is normally maintained within the container, in order to avoid the formation of dust, is usually produced by suction fans.
  • the rotational movement of the grinding container can also be used for this purpose.
  • the axis of the grinding container can in principle be inclined at any desired angle relative to the ground surface, but in particular in larger machines the axis will preferably extend vertically or'at an angle.
  • the mounting can be at the top or at the bottom, or at both ends, or at the periphery.
  • step (d) usually involves only a slight change in loading on the grinding member mounting. In both cases this is because the grinding member is supported in operation against the grinding face of the container,
  • the good cooling action also makes it possible to carry out low-temperature grinding.
  • the armouring on the grinding surface of the grinding container, and the grinding members, can :be formed from composite materials, with a permanently rough surface. Grinding members of a stratified structure can be used (plates of material of varying hardness, bonded together by a bonding agent and reinforcing).
  • the grinding members do notlift away from the ma- 'terial being ground, which can also apply in respect of balls.
  • Conditions are advantageous for using electrostatic and magnetic polarisation fields, and for the magnetic and pneumatic separation of material in the upper part of the grinding chamber.
  • the rotating systems act as a stabilising gyroscope. Therefore little natural oscillationoccurs. The remaining oscillation effect can be prevented from affecting the ground below the mill, by suitable structuring.
  • the mill can be loaded in dependence on the motor loading (sensing of the motor output) Not only the shape of the grinding members but also their materials can be varied within wide limits. Grinding can be effected wet or dry, with or without balls.
  • FIG. 1 shows a diagrammatic view in vertical crosssection through a mill according to the invention
  • FIG. 2 shows a diagrammatic plan view of half of the millshown in FIG. 1,
  • FIG. 3 shows a diagrammatic view in horizontal
  • FIGS. 4 to 6 show alternative embodiments of the grinding members
  • FIG. 7 shows an embodiment in which the grinding member shaft is guided and in addition the grinding member carrier rotates about an axis which is eccentric relative to the axis of the grinding container
  • FIG. 8 is a view, similar to that of FIG. 1', of another embodiment of the mill. 3
  • the grinding container 1 is a substantially cylindrical vessel whose casing is provided with strengthening rings (not shown in greater detail) and which forms on its inward surface the grinding track 2 upon which the material (not shown) to be ground lies.
  • the grinding members 3 roll over the materialto be ground on .the grinding track 2, in operation of the mill.
  • the grinding container 1 is rotatably mounted on the frame R on a hollow shaft member Z and is fixedly connected to a Vbelt pulley combination S which provides for the drive by means of a motor.
  • the grinding container however could also be driven in another manner,
  • the central shaft A of the grinding member system extends through the shaft member Z and is supported therein.
  • the shaft A is concentric to the axis of rotation of the grinding container 1 and at its bottom end carries a V-belt wheel 8 for driving the shaft A.
  • the shaft A has an enlarged portion A in the interior of the grinding container 1, which carries rigid radial arms 30 upon which are mounted trailing levers 32 which are pivotal about shafts 31 parallel to the shaft y A.
  • the shafts 33 of the grinding members are mounted on the levers 32.
  • the grinding container can in turn be driven in rotation either in the direction of the solid-line arrow P, in the opposite direction tothe direction of the arrow K, or in the same direction as the direction of the arrow K, in the direction indicated by the broken-line arrow P.
  • the grinding container and the grinding members are always driven at a speed of rotation which is substantially above the critical speed, so that the material (not shown) to be ground is pressed against the grinding track 2, and the roller-shaped grinding members 3 are pressed against the material to be ground.
  • the grinding members 3 act with a multiple of their weight on the layer of material to be ground on the track 2, and swirl this material up. If the pressure is to be increased without raising the speed of rotation, additional weights 34 can be supported for this purpose on the grinding member shafts 33, which additional weights 34 can be shaped in accordance with flow principles, as illustrated.
  • the grinding container 1 is open at the top. Its opening is covered by a stationary hood 4 in which there is a pipe 40 or 40' for the supply of material to be ground into the container 1, while in the centre is a passage 41 for the supply of air. Around the passage 41 is an annuduced through the pipe 41. Disposed below the pipe I 41, and fixedly connected to the shaft A of the grinding member drive arrangement, is a blade wheel 5 with adjustable blades 51. The amount of air impelled by the wheel 5 into the interior of the container 1 can be controlled by adjustment of the position of the blades 51.
  • the blade wheel 5 could also be replaced by a control plate which is stationarily connected to the rotor 41, to provide a similar function, for passive control of the air introduced into the container.
  • the air supply pipe By suitably extending the air supply pipe to the bottom of the container 1, it is possible for the air to be introduced below the grinding member arms 30 so that, rising to the hood 4.and .to the suction pipe 43, the introduced air is directly charged with fine material.
  • each grinding member is in the form of a single large roller 30 which is mounted on a lever 30a corresponding to the lever 30 in FIG. 3.
  • three grinding members 3b and 30 respectively, are mounted on each lever 30b or 300 respectively.
  • the grinding members 3b are of a tapered configuration, so that they permit particularly high pressures on the material to be ground, and are particularly suitable when used in conjunction with grinding balls.
  • the grinding members 30 act upon a much smaller surface area than the grinding member 3a, so that they also make it possible to produce relatively high pressures. They also have out-of-balance weights or. out-of-balance bores 3c, so that they each rotate individually eccentrically.
  • out-of-balance weights or. out-of-balance bores 3c so that they each rotate individually eccentrically.
  • the embodiment shown in FIG. 5 is particularly suitable for using the machine as a ball mill.
  • grinding balls of small diameter are used, which give a much greater number of point contacts than grinding balls of larger diameter.
  • the speed of the grinding member carrier must be so determined in this case that the loading is adapted to the material of the balls.
  • FIG. 7 illustrates the above-mentioned eccentric arrangement of the grinding member carrier 5 relative to the shaft A of the container 1.
  • the degree of eccentricity is shown in exaggerated form, whereas in actual fact it is about 5 mm, so that the difference in the lengths of travel is from 1 to 6 percent.
  • FIG. 7 also shows the annular construction of grinding members, namely, the hub 3a is covered with a layer 3b of resilient material, for example hard rubber, upon which is fitted, so as to lie closely thereagainst, a grinding ring 3c which comprises material having a high resistance to wear, so that the transmission to the spindle 3a of vibration occurring in the grinding ring 30 is damped.
  • the swing arms 32 are extended beyond the rotary shaft 33a in the manner of a wagon pole 32.
  • Rigidly mounted on the radial arm 30 is a strut 52 which ends in a fork or a slotted member 53. The pole 32' is guided in the slot of the fork or in the slotof the member 53.
  • a traction spring 54 which connects the pole 32' to the enlarged portion A of the shaft A, as shown in'FIG. 1, ensures that the grinding member is not pressed. against the material to be ground in such a way as-to produce a strong shearing action, for example in the event of an interruption in current or some other mishap.
  • the springs 54 are only shown diagrammatically in FIG. 7, but they can also be of a different construction with an adjustable spring force, in order in this way that the pressure of the grind ing members against the material to be ground can be adapted in .accordance with the conditions of various materials to be ground.
  • FIG. 8 shows a mill according to the invention in which the container 1 and the grinding member carrier A rotate in the same direction of rotation, the container preferably rotating at a faster speed of rotation.
  • the-shaft A" is extended through the container and the hood 4', and is mounted at its lower end in a support frame T fitted on the frame. R.
  • the hood 4 is sealed relative to the container 1' by means of a resilient lip 55 which lies on an annular bead 56 secured to the top side of the container 1.
  • the lip 55 is also pressed resiliently against the bead 56 by a tube member 57 which is filled with compressed air and which bears against a ring 58. This sealing action is particularly suitable if the grinding operation is carried out under a reduced pressure or in an atmosphere "of low-temperature gas. a
  • ventilation ribs (not shown) can be fitted on the end faces of the grinding members 3, so that the air flow produced in the grindingchamber in the container can with the invention are given hereinafter, but it should.
  • Peripheral speed of the grinding member carrier Peripheral speed of the grinding member rollers kg 740 at the speed of rotation 400 kg I2000 7.3 m/sec at 400 r.p.m. 29.0 m/sec at I00 r.p.m. 5.5 m/sec at 400 r.p.m. 22.0 m/sec at I00 r.p.m. 14.6 m/sec. at 400 r.p.m. 58.5 m/sec Number of times that all points on the grinding surface of the container are rolled over:
  • this grinding operation can be carried out with an even greater saving of power if an electric motor 59 with two shaft ends 60 and 61 is used for the whole drive for the machine.
  • the shaft end 60 drives the container 1, while the second shaft end 61 is connected by way of the V-belt wheel S to the grinding member carrier A, and acts as'a brake.
  • the power which is put out by way of the grinding member carrier A is therefore supplied to the same motor shaft, so that there is no necessity for conversion into electrical power.
  • FIG. 8 also shows a discharge channel 62 for the fine material.
  • the channel 62 is connected to a hood 63 with a downwardly directed aperture, the hood 63 being secured to the grinding member carrier A and consequently rotating therewith.
  • the hood 63 extends through a circular opening in the bottom of the container. l, and its end opens into a stationary hopper 64 which encloses the shaft A" and into which the ground fine material is discharged.
  • a discharge channel of this show very remarkable average performances. However, they only provide some datum points. a i
  • the invention is equally well suited for the construction of small, medium and large mills, for high levels of throughput are achieved with relatively low weight and building material cost, and a relatively small amount of space.
  • A, mill comprising a. a grinding container arranged to contain material to be ground and having an axis ftherein about which the container is drivably rotatable at an overcritical speed of rotation and an internal cylindrical material grinding face,
  • a grinding member carrier positioned within the I grinding container and rotatable therein at an overd. grinding members rotatably mounted on said trailing arms within said container inwardly from said grinding face at a position on said trailing arms spaced from the point of pivotal attachment to said carrier,
  • a mill according to claim 1 wherein grinding members of identical configuration are mounted diametrically opposite each other with respect to the axis to form pairs of grinding members and there are differences of configuration as between said pairs;
  • a mill according to claim 1 wherein the normal speeds of rotation of the grinding container and the grinding members are in a range in which the centrifugal forces in the region of the material to be ground and at the grinding members have a value which exceeds to several hundred times their weight.
  • a mill according to claim 1 comprising pairs of disc-shaped grinding members of conical cross-section, and grinding balls arranged between the grinding discs.
  • a mill according to claim 1 comprising air impeller blades positioned within and arranged to rotate within the grinding container.
  • a mill according to claim 1 wherein the grinding container and the grinding member carrier are arranged to rotate in the same direction and the grinding 14 container rotates at a higher speed of rotation whereby drive power flows from the grinding container through the layer of material being ground, to the grinding members, and from there to the grinding member carrier.
  • a mill according to claim 9 comprising a single drive motor with two shaft ends, of which one shaft end drives the container and thesecond shaft end is connected to the grinding member carrier whereby the grinding member carrier is braked.
  • a mill according to claim 1 wherein the movement of the grinding members in an outward direction under the effect of centrifugal force is limited by a mechanical abutment.
  • a mill according to claim 12, wherein a spring for limiting the outward movement of the grinding members is constructed with an adjustable spring force.
  • Apparatus according to claim 1 wherein the axis of rotation of the grinding member carrier is arranged eccentrically with respect to the axis of rotation of the grinding container.
  • a mill according to claim 1, comprising discharge means from said container for the fine material produced in the grinding operation, which discharge means rotates with the grinding member carrier.
  • discharge means comprises a substantially radially extending discharge channel whose outlet aperture co-operates with anannular stationary hopper which surrounds the axis of the grinding container.
  • the grinding members comprise a plurality of rings having hubs which carry at least one layer of resilient material and grinding rings comprising a material which has a high resistance to wear comprises the grinding surface of the members.
  • the grinding members comprise pairs of grinding rollers,-in which the grinding rollers are rigidly mounted on both sides of the centre of their axis which is formed as a spindle, and the spindle is rotatably mounted at its centre part in the associated trailing arm.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US450239A 1973-03-14 1974-03-11 Mill which operates at an overcritical speed of rotation Expired - Lifetime US3910509A (en)

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CH373273A CH558678A (de) 1973-03-14 1973-03-14 Mit ueberkritischer drehzahl arbeitende muehle und verfahren zu ihrem betrieb.

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US (1) US3910509A (fr)
JP (1) JPS5730536B2 (fr)
BR (1) BR7401981D0 (fr)
CA (1) CA1015726A (fr)
CH (1) CH558678A (fr)
DE (1) DE2410075A1 (fr)
FR (1) FR2221186B1 (fr)
GB (1) GB1460805A (fr)
SE (1) SE408140B (fr)
ZA (1) ZA741645B (fr)

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WO2000050174A1 (fr) * 1999-02-22 2000-08-31 Nara Machinery Co., Ltd. Dispositif de traitement de matiere particulaire
CN1309478C (zh) * 2004-03-18 2007-04-11 张仁鸿 研粉机的磨轮调整机构
CN100574886C (zh) * 2006-12-31 2009-12-30 杨连国 磨辊机构装置
US20150217298A1 (en) * 2012-08-17 2015-08-06 Hunan Zhonghong Heavy Machinery Co., Ltd. Flexible vertical grinder

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AU1871983A (en) * 1982-09-06 1984-03-15 Gygi, Martin H Roller mill
FR2634141B1 (fr) * 1988-07-12 1994-04-29 Cambier Benjamin Broyeur cylindrique comportant des rouleaux interieurs de broyage
JP2594213B2 (ja) * 1992-03-25 1997-03-26 株式会社奈良機械製作所 粒子状材料処理装置
JP2755519B2 (ja) * 1992-05-12 1998-05-20 福田金属箔粉工業株式会社 粉砕装置
KR100338465B1 (ko) * 1999-09-21 2002-06-05 박태주 금속슬러지 분쇄장치
GB2412888B (en) * 2004-04-08 2006-02-22 Jin-Hong Chang Grinding mill
JP5650085B2 (ja) * 2011-10-03 2015-01-07 田村　允孝 ロールミル
CN102806120B (zh) * 2012-08-17 2014-03-12 湖南中宏重型机器有限公司 环碾型立式磨机碾压力可调式锤轮机构
CN103480461A (zh) * 2013-08-30 2014-01-01 桂林晟兴机械制造有限公司 杠杆式复辊磨粉机
FR3043342B1 (fr) * 2015-11-05 2021-12-10 Broyeurs Poittemill Ingenierie Broyeur pendulaire perfectionne
CN108906230B (zh) * 2018-09-18 2020-07-14 深圳市绿雅生态发展有限公司 一种环保型园林落叶用多级粉碎装置

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US2177945A (en) * 1936-09-19 1939-10-31 Beardsley & Piper Co Mulling apparatus
US2303319A (en) * 1939-11-01 1942-12-01 Beardsley & Piper Co Mulling apparatus
US2463556A (en) * 1945-07-02 1949-03-08 Pettibone Mulliken Corp Mulling apparatus

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US1936593A (en) * 1925-04-27 1933-11-28 Fraser George Holt Pulverizer and separator
US2177945A (en) * 1936-09-19 1939-10-31 Beardsley & Piper Co Mulling apparatus
US2303319A (en) * 1939-11-01 1942-12-01 Beardsley & Piper Co Mulling apparatus
US2463556A (en) * 1945-07-02 1949-03-08 Pettibone Mulliken Corp Mulling apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050174A1 (fr) * 1999-02-22 2000-08-31 Nara Machinery Co., Ltd. Dispositif de traitement de matiere particulaire
US6454194B1 (en) 1999-02-22 2002-09-24 Nara Machinery Co., Ltd. Granular material processing apparatus
KR100487459B1 (ko) * 1999-02-22 2005-05-06 가부시키가이샤 나라기카이세이사쿠쇼 입자형 재료 처리 장치
CN1309478C (zh) * 2004-03-18 2007-04-11 张仁鸿 研粉机的磨轮调整机构
CN100574886C (zh) * 2006-12-31 2009-12-30 杨连国 磨辊机构装置
US20150217298A1 (en) * 2012-08-17 2015-08-06 Hunan Zhonghong Heavy Machinery Co., Ltd. Flexible vertical grinder
US9764328B2 (en) * 2012-08-17 2017-09-19 Hunan Zhonghong Heavy Machinery Co., Ltd Flexible vertical grinder

Also Published As

Publication number Publication date
JPS5730536B2 (fr) 1982-06-29
ZA741645B (en) 1975-02-26
SE408140B (sv) 1979-05-21
FR2221186B1 (fr) 1978-02-17
DE2410075A1 (de) 1974-09-26
GB1460805A (en) 1977-01-06
FR2221186A1 (fr) 1974-10-11
JPS5052660A (fr) 1975-05-10
BR7401981D0 (pt) 1974-11-19
CA1015726A (en) 1977-08-16
CH558678A (de) 1975-02-14

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